My backyard is mostly in a downslope and the soil is black clay and lime. I have been gardening for the last 5 yrs. but I noticed fruit trees do not do well. Anybody here who gardens in a downslope and the water does not drain down to the root of my plants. HELP!! any suggestions?

My backyard is mostly in a downslope and the soil is black clay and lime. I have been gardening for the last 5 yrs. but I noticed fruit trees do not do well. Anybody here who gardens in a downslope and the water does not drain down to the root of my plants. HELP!! any suggestions?